Class / Patent application number | Description | Number of patent applications / Date published |
065435000 | With fiber stretching, drawing, or pulling (e.g., from rod, etc.) | 23 |
20080216516 | METHOD OF MANUFACTURING OPTICAL FIBER - A coating is applied on an optical fiber drawn from a melted tip of an optical-fiber preform. A glass spin is applied to a coated optical fiber by gripping the coated optical fiber with at least a pair of spinning applying rollers arranged in different levels with parallel rotation axes, rotating the spinning applying rollers so that the coated optical fiber is guided in a predetermined direction, and alternately shifting the spinning applying rollers in opposite directions along the rotation axes. The glass spin is applied to the coated optical fiber in a state in which each of the rotation axes is tilted at a predetermined angle from a plane perpendicular to the first direction. | 09-11-2008 |
20090013726 | GLASS BASE MATERIAL, MANUFACTURING METHOD THEREOF, AND METHOD FOR MANUFACTURING OPTICAL FIBER - When forming a taper portion on an end of a glass base material for manufacturing an optical fiber, the taper portion is formed by fusing the glass base material from a modified point after modifying a center-line displacement amount of a fusing point for a center line of the glass base material to a value not more than a predetermined numeric value. Moreover, in a glass base material for drawing having an effective straight base with an average outside diameter D and a taper portion on one end of the effective straight base, when the glass base material is attached to a drawing apparatus, a ratio δ/D between the average outside diameter D and a taper portion distortion δ is δ/D<=0.03, and the taper portion distortion δ is expressed with a maximum value of a center-line displacement amount of the glass base material between an effective straight base end from the taper portion and a distortion evaluating end of the taper portion. In this way, eccentricity of an optical fiber in an early stage of the start of drawing is immediately reduced, and thus the excess length is reduced. | 01-15-2009 |
20090158778 | Process for making a glass fiber with a core and two glass cladding layers and glass fiber made thereby - The glass fiber for an optical amplifier has a glass core, a first glass cladding, and a second glass cladding. The core has a composition, in mol %, of Bi | 06-25-2009 |
20090241603 | OPTICAL FIBER MANUFACTURING METHODS - Optical fiber manufacturing methods, which manufacture optical fibers with uniform characteristics using a simple device construction, are provided. The optical fiber manufacturing methods comprise, drawing a glass fiber from a glass preform by heating and melting one end of the glass preform and coating at least one layer of resin around the circumference of the drawn glass fiber. The method includes the steps of decreasing the viscosity of the resin from an initial viscosity during a start-up process time to a steady viscosity as optical fiber draw speed increases, wherein the steady viscosity is a predetermined viscosity; and increasing the draw speed during the start-up process time to a faster steady speed. | 10-01-2009 |
20090241604 | OPTICAL FIBER DRAWING METHODS AND DRAWING FURNACES - Drawing methods and drawing furnaces for drawing an optical fiber with small non-circularity by simple drawing system are provided. An optical fiber preform is received into a muffle tube and heated by a primary heater placed to surround the muffle tube. The optical fiber preform is heated such that a starting position of a meniscus portion is higher in its position than the top of the primary heater, wherein the meniscus portion is created at the bottom portion of the optical fiber preform. | 10-01-2009 |
20090260401 | HEATER HAVING MULTI HOT-ZONES, FURNACE HAVING THE HEATER FOR DRAWING DOWN OPTICAL FIBER PREFORM INTO OPTICAL FIBER, AND METHOD FOR DRAWING OPTICAL FIBER USING THE SAME - Disclosed is a heating element having a ring shape provided in a furnace for drawing an optical fiber from a large-diameter preform so as to heat and melt a preform. The heating element according to heating element includes at least two hot zones having different heating temperatures, wherein one of the hot zones is arranged in a neck-down region of the preform to heat the preform at a temperature suitable for drawing an optical fiber. Also, the hot zone includes a first heating unit for heating a preform at a temperature suitable for draw an optical fiber from the preform; and a second heating unit for heating a surface of the preform to a relatively lower temperature than the first heating unit. | 10-22-2009 |
20090308106 | Electric furnace extension method and extension apparatus for optical fiber glass preform - An electric furnace extending method and apparatus for an optical fiber glass body alignment when connecting the extension use body and pulling member and making it possible to immediately start the extension after the fusing of the connection portion. A centering mechanism for centering the free end portion of the body and member on the furnace center side is provided between the furnace pipe of the electric furnace and grips of the extension use glass body and between the furnace pipe and the pulling member. The free end portion is centered by this centering mechanism, then the gripped sides of the body and member are fixed, the front ends of the two free end portions are abutted and fused and bonded at the highest temperature portion inside the electric furnace, then the highest temperature portion is moved to the extension portion of the glass body side and the extending of the glass body is commenced. | 12-17-2009 |
20100024486 | METHOD OF PRODUCING OPTICAL FIBER PREFORM - A method of producing an optical fiber preform comprising: performing production of a glass preform having a valid portion to be drawn to an optical fiber and invalid portions disposed to both ends of the valid portion by depositing a porous silica glass body on a periphery of a glass rod; and performing vitrification of the porous silica glass body by heat treating the glass preform, wherein, during the vitrification, at least a portion of the porous silica glass body in the invalid portion of at least one end is dislocated relative to the glass rod along the axial direction of the glass rod such that a stress between the glass rod and the porous silica glass body is relaxed. | 02-04-2010 |
20100139323 | OPTICAL FIBER MANUFACTURING APPARATUS AND OPTICAL FIBER MANUFACTURING METHOD - An optical fiber manufacturing apparatus for manufacturing an optical fiber by drawing a optical fiber preform, including: a drawing furnace having therein a muffle tube into which the optical fiber preform is inserted and heating the optical fiber preform; and a first seal member which is disposed at an insert side of the drawing furnace so as to be coaxial with the drawing furnace and which seals the optical fiber preform inserted into an opening formed at the center thereof, wherein the first seal member includes a plurality of inner-circumference slits formed in the inner circumference thereof and a plurality of outer-circumference slits formed in the outer circumference thereof. | 06-10-2010 |
20110011135 | METHOD OF MAKING A GLASS PREFORM - The method that enables high yield production of a glass preform comprises an assembling step, a soot deposition step, a pulling step, a consolidation step, and a collapse step. In at least one traverse of the reciprocating movement during the soot deposition step, the relative transfer velocity of the base rod unit and the glass synthesizing burner in a second range is made slower than the relative transfer velocity of the base rod unit and the glass synthesizing burner in a first range, where the first range is a range extending from a boundary position to the tip portion of the starting mandrel and the second range is a range extending from the boundary position to a part of the tubular handle, the boundary position being a position that is 30 mm or more distanced from one end of the tubular handle to the direction of the tip portion of the starting mandrel. | 01-20-2011 |
20110094269 | OPTICAL FIBER MANUFACTURING METHOD - An optical fiber manufacturing method comprises preparing first base materials each of which includes at least one core forming part to form a core and a cladding forming part to form a cladding; performing a first elongating to form second base materials by forming a first bundle by bundling two or more base materials including at least one of the first base materials having been prepared at the preparing and by thermally elongating the first bundle; and performing a second elongating at least once to form a second bundle by bundling two or more base materials including at least one of the second base materials and by thermally elongating the second bundle, wherein the second bundle is thermally elongated up until the point when the optical fiber is formed at the second elongating. | 04-28-2011 |
20110132039 | GLASS PREFORM DRAWING APPARATUS - A glass preform drawing apparatus feeds a glass preform into a heating furnace at a predetermined feeding speed and produces a glass rod having a uniform diameter. Specifically, the drawing apparatus for producing a glass rod having a desired outer diameter by heating and drawing a glass preform is characterized in that, at a normal operating temperature T (K) of the heating furnace, the top chamber is transparent at a wavelength of λ (μm) expressed by the following formula 1: | 06-09-2011 |
20110289980 | METHOD FOR PRODUCING OPTICAL FIBER USING LINEAR NON-CONTACT FIBER CENTERING - An optical fiber production system and method are provided for producing optical fiber. An optical fiber is drawn from a preform in a furnace and passes through a treatment device under a controlled reduced pressure or partial vacuum in the range of 0.01 to 0.8 atm. The treatment device cools the bare optical fiber as it cools to a temperature range of at least 1,600° C. to 1,300° C. A non-contact fiber centering device is located near an exit of the treatment device to provide linear centering of the optical fiber as it exits the treatment device. | 12-01-2011 |
20120017644 | METHOD FOR DRAWING GRIN LENS FIBER - When drawing of a GRIN lens from a preform is started, wastage of the preform is reduced and the amount of time taken from the start of elongation of the preform to the start of winding is reduced. A preform, to a lower end of which a weight formed of silica is fused, is set in a heating furnace, and drawing of the preform is started by heating a fused portion where the preform and the weight are fused to each other. This can reduce wastage of the preform. Since an elongation speed of the preform is increased by the weight of the weight, the amount of time taken from the start of the elongation of the preform to the start of winding can be decreased. | 01-26-2012 |
20120186304 | MICROSTRUCTURED TRANSMISSION OPTICAL FIBER - Microstructured optical fiber for single-moded transmission of optical signals, the optical fiber including a core region and a cladding region, the cladding region including an annular void-containing region that contains non-periodically disposed voids. The optical fiber provides single mode transmission and low bend loss. | 07-26-2012 |
20130061637 | OPTICAL FIBER PREFORM AND METHOD OF MANUFACTURING OPTICAL FIBER USING OPTICAL FIBER PREFORM - An optical fiber preform that is used in a method in which a core rod that forms a core is inserted into a quartz tube that forms a cladding, and at the same time as they are fiber-drawn, the quartz tube and the core rod are formed into a single body, includes: a tapered portion that is formed by grinding an outer circumferential portion of a distal end portion of the quartz tube into a tapered shape; and a conical portion that is formed by welding a dummy tube that has substantially the same outer diameter as the outer diameter of a distal end portion of the tapered portion to the distal end portion of the tapered portion, and by applying heat to the dummy tube and stretching out the dummy tube, where the core rod is inserted inside the quartz tube. | 03-14-2013 |
20130186148 | GLASS BASE MATERIAL ELONGATING METHOD AND GLASS BASE MATERIAL ELONGATING APPARATUS - Provided is a glass base material elongating method of using a glass base material elongation apparatus including a heating furnace, a feeding mechanism, and a pulling mechanism to elongate the rod-shaped glass base material to form a thinner glass rod, the method comprising gripping a pulling dummy rod connected to a bottom end of the glass base material with first pulling rollers of the pulling mechanism and, together with the feeding mechanism, feeding the glass base material to the heating furnace; and before a pulling force necessary for pulling the pulling dummy rod to elongate the glass base material reaches a load force that causes slipping between the pulling dummy rod and the first pulling rollers, gripping and pulling the pulling dummy rod with second pulling rollers of the pulling mechanism in addition to the first pulling rollers. | 07-25-2013 |
20130255323 | METHOD AND APPARATUS FOR MANUFACTURING OPTICAL FIBER - Provided is a method for manufacturing an optical fiber. The method includes the steps of: heating and melting a silica-based optical fiber preform in a drawing furnace; drawing the melted preform into a linear shape from the drawing furnace, continuously cooling and solidifying the preform to form a bare optical fiber; coating the bare optical fiber with a resin to form an optical fiber; and continuously taking up the optical fiber while applying a tensile force, wherein, when a surface temperature of the cooled and solidified bare optical fiber reached down to 100° C. or lower, a surface of the bare optical fiber is reheated while applying a tensile force so as to remelt only a surface layer of the bare optical fiber, and the surface layer of the bare optical fiber is re-solidified, the bare optical fiber is coated with a resin, and the tensile force is released afterward. | 10-03-2013 |
20130327097 | METHOD OF MANUFACTURING AN OPTICAL FIBER - A manufacturing method that enables stably making a high-quality optical fiber is provided. The manufacturing method of the present invention comprises: a softened portion falling step in which an optical fiber preform is heated in a heating furnace and a dropping part of softened portion of the preform thus heat-softened is allowed to drop; and a drawing step for drawing the preform such that the softened glass is drawn into a fiber by applying a tension with a take-up means after the softened portion falling step, whereas the preform is rotated about its axis at the softened portion falling step. | 12-12-2013 |
20150321945 | OPTICAL FIBER MANUFACTURING APPARATUS AND METHOD - An optical fiber manufacturing apparatus includes: a cylindrical shield pipe that is provided above a drawing furnace, and forms a space continuous with the heating space in a vertical direction; a sending rod that has a lower end attached to an optical fiber preform and a lower portion disposed inside the shield pipe, and is configured to insert the optical fiber preform into a heating space of the drawing furnace in the vertical direction; an alignment mechanism that is configured to move the sending rod in a horizontal direction; an inner sealing body that is attached to the lower portion of the sending rod; and an outer sealing body that is mounted on the inner sealing body, is configured to move in the horizontal direction with respect to the inner sealing body, and is spaced apart from the sending rod. | 11-12-2015 |
20150368143 | METHOD OF MANUFACTURING AN OPTICAL FIBER - A manufacturing method that enables stably making a high-quality optical fiber is provided. The manufacturing method of the present invention comprises: a softened portion falling step in which an optical fiber preform is heated in a heating furnace and a dropping part of softened portion of the preform thus heat-softened is allowed to drop; and a drawing step for drawing the preform such that the softened glass is drawn into a fiber by applying a tension with a take-up means after the softened portion falling step, whereas the preform is rotated about its axis at the softened portion falling step. | 12-24-2015 |
20160002090 | OPTICAL FIBER DRAWING METHOD AND OPTICAL FIBER DRAWING APPARATUS - Capacity of space in a drawing furnace is decreased so as to reduce variations in pressure in the furnace and also the side of an insertion port of a glass perform is stably sealed. When drawing is started, an outer peripheral surface of the optical fiber glass preform | 01-07-2016 |
20160145145 | OPTICAL FIBER BASE MATERIAL DRAWING METHOD - An optical fiber base material drawing method for forming a constricted shape having a reduced diameter along a longitudinal direction of the optical fiber base material in a predetermined constricted shape segment in the longitudinal direction of the optical fiber base material at one end of the optical fiber base material, including: starting heating of the optical fiber base material with a heating source from a heating start position positioned in the constricted shape segment; then heating the optical fiber base material with the heating source in another segment having a predetermined length adjacent to the constricted shape segment; then returning the heating source to the heating start position and softening the optical fiber base material in the constricted shape segment by heating the optical fiber base material; and then forming the constricted shape by reducing the diameter of the optical fiber base material by applying a tensile force thereto. | 05-26-2016 |